Test http://www.w3.org/2001/DOM-Test-Suite/level1/core/nodeinsertbeforerefchildnull

<test name='nodeinsertbeforerefchildnull' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>nodeInsertBeforeRefChildNull</title>
          <creator>NIST</creator>
          <description> If the "refChild" is null then the "insertBefore(newChild,refChild)" method inserts the node "newChild" at the end of the list of children. Retrieve the second employee and invoke the "insertBefore(newChild,refChild)" method with refChild=null. Since "refChild" is null the "newChild" should be added to the end of the list. The last item in the list is checked after insertion. The last Element node of the list should be "newChild". </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2001-08-17</date>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core#ID-952280727'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='elementList' type='NodeList'/>
     <var name='employeeNode' type='Node'/>
     <var name='childList' type='NodeList'/>
     <var name='refChild' type='Node' isNull='true'/>
     <var name='newChild' type='Node'/>
     <var name='child' type='Node'/>
     <var name='childName' type='DOMString'/>
     <var name='insertedNode' type='Node'/>
     <load var='doc' href='staff' willBeModified='true'/>
     <getElementsByTagName interface='Document' obj='doc' tagname='"employee"' var='elementList'/>
     <item interface='NodeList' obj='elementList' index='1' var='employeeNode'/>
     <childNodes obj='employeeNode' var='childList'/>
     <createElement obj='doc' tagName='"newChild"' var='newChild'/>
     <insertBefore var='insertedNode' obj='employeeNode' newChild='newChild' refChild='refChild'/>
     <lastChild interface='Node' obj='employeeNode' var='child'/>
     <nodeName obj='child' var='childName'/>
     <assertEquals actual='childName' expected='"newChild"' id='nodeInsertBeforeRefChildNullAssert1' ignoreCase='false'/>
</test>

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